The GRE, or Graduate Record Examinations, General Test focuses on general skills needed to succeed in graduate school. There are also GRE Subject Tests in biochemistry, cell and molecular biology; biology; chemistry; computer science; literature in English; mathematics; physics; and psychology.
The GMAT, or Graduate Management Admission Test, focuses on skills needed for a graduate degree in business and management.
Both the GRE General Test and GMAT test analytical writing, verbal reasoning and quantitative reasoning. Both tests have adaptive computer-based exams that analyze responses and provide new questions based on the performance on previous questions.
Both tests have free preparation software available for download on their official websites. A variety of third-party vendors offers preparation courses, and a range of preparation materials is available in many bookstores.
The analytical-writing sections of both tests score between zero and six, with half-point increments. The total scoring and scoring of the verbal reasoning and quantitative reasoning sections is subject to change. Check the official websites for current information.